76 lines
2.0 KiB
C#
76 lines
2.0 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace SteamAPIValidator;
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public static class SteamApiValidator
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{
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private const int MAX_PATH_SIZE = 32767;
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[DllImport("kernel32.dll")]
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private static extern IntPtr LoadLibrary(string dllToLoad);
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[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
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private static extern IntPtr GetModuleHandle(string lpModuleName);
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[DllImport("kernel32.dll", SetLastError = true)]
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private static extern uint GetModuleFileName([In] IntPtr hModule, [Out] StringBuilder lpFilename, [In][MarshalAs(UnmanagedType.U4)] int nSize);
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public static bool IsValidSteamApiDll()
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{
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string text = (Environment.Is64BitProcess ? "steam_api64.dll" : "steam_api.dll");
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IntPtr intPtr = GetModuleHandle(text);
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if (intPtr == IntPtr.Zero)
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{
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intPtr = LoadLibrary(text);
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}
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if (intPtr == IntPtr.Zero)
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{
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return false;
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}
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if (intPtr != IntPtr.Zero)
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{
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StringBuilder stringBuilder = new StringBuilder(32767);
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if (GetModuleFileName(intPtr, stringBuilder, 32767) != 0)
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{
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return CheckIfValveSigned(stringBuilder.ToString());
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}
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}
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return false;
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}
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public static bool IsValidSteamClientDll()
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{
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IntPtr moduleHandle = GetModuleHandle(Environment.Is64BitProcess ? "steamclient64.dll" : "steamclient.dll");
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if (moduleHandle != IntPtr.Zero)
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{
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StringBuilder stringBuilder = new StringBuilder(32767);
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if (GetModuleFileName(moduleHandle, stringBuilder, 32767) != 0)
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{
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return CheckIfValveSigned(stringBuilder.ToString());
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}
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}
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return false;
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}
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private static bool CheckIfValveSigned(string filePath)
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{
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try
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{
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IntPtr phCertStore = IntPtr.Zero;
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IntPtr phMsg = IntPtr.Zero;
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IntPtr ppvContext = IntPtr.Zero;
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if (!WinCrypt.CryptQueryObject(1, Marshal.StringToHGlobalUni(filePath), 16382, 14, 0, out var _, out var pdwContentType, out var _, ref phCertStore, ref phMsg, ref ppvContext))
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{
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return false;
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}
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return pdwContentType == 10;
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}
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catch
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{
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return false;
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}
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}
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}
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